24. » NEW YORK STATE MUSEUM 
rata so as to present a fair comparison. In the following tabula- 
tion we have assumed that 400 apples would fill a barrel. This is 
an approximate figure and equally fair for both the sprayed and 
the unsprayed trees. 
Comparative results of one spray during four seasons 









TOTAL FRUIT TOTAL CLEAN WORMY APPLES 
TREATMENT | | End wormy Side wormy 
No. | Bbls. No. Bbls. 
| No? | Bbis. |) 2&= Il Nos | Boles fees 
| r cent cent 
| 
Sprayede a. o.a-: 169278| 423 | 165165 AI2? 407 I 353] 3516 83| 2.19 
Unsprayed...... 169340 423%| II5150 2872| 22555 562|21.73 | 17355 481| 18.37 
Diference....... 62 +) 50015 125 22148 554/21.377| 16839 392| 16.18 






The contrast between sprayed and unsprayed fruit is evident at 
once from a scrutiny of the above figures. A yield of about 423 
barrels should, if the trees are well sprayed but once, produce 
41234 barrels of sound apples, while unsprayed trees bearing an 
equal amount of fruit, would yield but 28734 barrels of worm-free 
apples, a difference of 125 barrels. A comparison of the end wormy 
apples shows at once where most of the efficacy lies, there being but 
one barrel of end wormy fruit on the sprayed trees, while the 
others produced 56% barrels of such apples, a difference of 551% 
barrels. There is a marked, though not such a great contrast in 
the yield of side wormy apples. The sprayed trees, it will be seen, 
produced but 834 barrels of such fruit, while the unsprayed 
trees yielded 48% barrels, a difference of nearly 40 barrels. The 
same contrasts are also shown in the number of apples and the per- 
centages of the various grades. 
Results obtained from spraying during the second period. 
This treatment is given about three weeks after the blossoms fall 
and is applied at that time because the young caterpillars are then 
- just beginning to feed and enter the fruit. Theoretically, making 
no allowances for peculiarities in habits, this spraying should give 
the best results, while as a matter of fact, returns indicate an effi- 
ciency approximately one-half that of the early treatment. Spray- 
ing at this time was done only in 1910 and ig1t. The results are 
tabulated on the following page. 
